415 lines
12 KiB
C
415 lines
12 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "setup.h"
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#ifndef CURL_DISABLE_HTTP
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/* -- WIN32 approved -- */
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include "urldata.h" /* it includes http_chunks.h */
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#include "sendf.h" /* for the client write stuff */
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#include "content_encoding.h"
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#include "http.h"
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#include "memory.h"
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#include "easyif.h" /* for Curl_convert_to_network prototype */
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* Chunk format (simplified):
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*
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* <HEX SIZE>[ chunk extension ] CRLF
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* <DATA> CRLF
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*
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* Highlights from RFC2616 section 3.6 say:
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The chunked encoding modifies the body of a message in order to
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transfer it as a series of chunks, each with its own size indicator,
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followed by an OPTIONAL trailer containing entity-header fields. This
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allows dynamically produced content to be transferred along with the
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information necessary for the recipient to verify that it has
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received the full message.
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Chunked-Body = *chunk
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last-chunk
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trailer
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CRLF
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chunk = chunk-size [ chunk-extension ] CRLF
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chunk-data CRLF
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chunk-size = 1*HEX
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last-chunk = 1*("0") [ chunk-extension ] CRLF
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chunk-extension= *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
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chunk-ext-name = token
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chunk-ext-val = token | quoted-string
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chunk-data = chunk-size(OCTET)
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trailer = *(entity-header CRLF)
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The chunk-size field is a string of hex digits indicating the size of
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the chunk. The chunked encoding is ended by any chunk whose size is
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zero, followed by the trailer, which is terminated by an empty line.
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*/
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void Curl_httpchunk_init(struct connectdata *conn)
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{
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struct Curl_chunker *chunk = &conn->data->reqdata.proto.http->chunk;
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chunk->hexindex=0; /* start at 0 */
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chunk->dataleft=0; /* no data left yet! */
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chunk->state = CHUNK_HEX; /* we get hex first! */
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}
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/*
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* chunk_read() returns a OK for normal operations, or a positive return code
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* for errors. STOP means this sequence of chunks is complete. The 'wrote'
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* argument is set to tell the caller how many bytes we actually passed to the
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* client (for byte-counting and whatever).
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*
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* The states and the state-machine is further explained in the header file.
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*
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* This function always uses ASCII hex values to accommodate non-ASCII hosts.
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* For example, 0x0d and 0x0a are used instead of '\r' and '\n'.
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*/
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CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
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char *datap,
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ssize_t datalen,
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ssize_t *wrotep)
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{
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CURLcode result=CURLE_OK;
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struct SessionHandle *data = conn->data;
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struct Curl_chunker *ch = &data->reqdata.proto.http->chunk;
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struct Curl_transfer_keeper *k = &data->reqdata.keep;
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size_t piece;
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size_t length = (size_t)datalen;
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size_t *wrote = (size_t *)wrotep;
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*wrote = 0; /* nothing's written yet */
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/* the original data is written to the client, but we go on with the
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chunk read process, to properly calculate the content length*/
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if ( data->set.http_te_skip )
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Curl_client_write(conn, CLIENTWRITE_BODY, datap,datalen);
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while(length) {
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switch(ch->state) {
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case CHUNK_HEX:
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/* Check for an ASCII hex digit.
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We avoid the use of isxdigit to accommodate non-ASCII hosts. */
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if((*datap >= 0x30 && *datap <= 0x39) /* 0-9 */
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|| (*datap >= 0x41 && *datap <= 0x46) /* A-F */
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|| (*datap >= 0x61 && *datap <= 0x66)) { /* a-f */
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if(ch->hexindex < MAXNUM_SIZE) {
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ch->hexbuffer[ch->hexindex] = *datap;
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datap++;
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length--;
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ch->hexindex++;
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}
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else {
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return CHUNKE_TOO_LONG_HEX; /* longer hex than we support */
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}
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}
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else {
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if(0 == ch->hexindex) {
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/* This is illegal data, we received junk where we expected
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a hexadecimal digit. */
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return CHUNKE_ILLEGAL_HEX;
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}
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/* length and datap are unmodified */
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ch->hexbuffer[ch->hexindex]=0;
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#ifdef CURL_DOES_CONVERSIONS
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/* convert to host encoding before calling strtoul */
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result = Curl_convert_from_network(conn->data,
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ch->hexbuffer,
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ch->hexindex);
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if(result != CURLE_OK) {
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/* Curl_convert_from_network calls failf if unsuccessful */
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/* Treat it as a bad hex character */
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return(CHUNKE_ILLEGAL_HEX);
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}
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#endif /* CURL_DOES_CONVERSIONS */
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ch->datasize=strtoul(ch->hexbuffer, NULL, 16);
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ch->state = CHUNK_POSTHEX;
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}
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break;
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case CHUNK_POSTHEX:
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/* In this state, we're waiting for CRLF to arrive. We support
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this to allow so called chunk-extensions to show up here
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before the CRLF comes. */
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if(*datap == 0x0d)
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ch->state = CHUNK_CR;
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length--;
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datap++;
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break;
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case CHUNK_CR:
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/* waiting for the LF */
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if(*datap == 0x0a) {
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/* we're now expecting data to come, unless size was zero! */
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if(0 == ch->datasize) {
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if (conn->bits.trailerHdrPresent!=TRUE) {
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/* No Trailer: header found - revert to original Curl processing */
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ch->state = CHUNK_STOPCR;
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/* We need to increment the datap here since we bypass the
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increment below with the immediate break */
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length--;
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datap++;
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/* This is the final byte, continue to read the final CRLF */
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break;
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}
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else {
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ch->state = CHUNK_TRAILER; /* attempt to read trailers */
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conn->trlPos=0;
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}
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}
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else {
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ch->state = CHUNK_DATA;
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}
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}
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else
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/* previously we got a fake CR, go back to CR waiting! */
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ch->state = CHUNK_CR;
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datap++;
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length--;
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break;
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case CHUNK_DATA:
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/* we get pure and fine data
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We expect another 'datasize' of data. We have 'length' right now,
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it can be more or less than 'datasize'. Get the smallest piece.
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*/
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piece = (ch->datasize >= length)?length:ch->datasize;
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/* Write the data portion available */
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#ifdef HAVE_LIBZ
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switch (conn->data->set.http_ce_skip?
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IDENTITY : data->reqdata.keep.content_encoding) {
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case IDENTITY:
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#endif
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if(!k->ignorebody) {
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if ( !data->set.http_te_skip )
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result = Curl_client_write(conn, CLIENTWRITE_BODY, datap,
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piece);
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else
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result = CURLE_OK;
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}
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#ifdef HAVE_LIBZ
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break;
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case DEFLATE:
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/* update data->reqdata.keep.str to point to the chunk data. */
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data->reqdata.keep.str = datap;
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result = Curl_unencode_deflate_write(conn, &data->reqdata.keep,
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(ssize_t)piece);
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break;
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case GZIP:
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/* update data->reqdata.keep.str to point to the chunk data. */
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data->reqdata.keep.str = datap;
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result = Curl_unencode_gzip_write(conn, &data->reqdata.keep,
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(ssize_t)piece);
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break;
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case COMPRESS:
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default:
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failf (conn->data,
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"Unrecognized content encoding type. "
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"libcurl understands `identity', `deflate' and `gzip' "
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"content encodings.");
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return CHUNKE_BAD_ENCODING;
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}
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#endif
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if(result)
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return CHUNKE_WRITE_ERROR;
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*wrote += piece;
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ch->datasize -= piece; /* decrease amount left to expect */
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datap += piece; /* move read pointer forward */
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length -= piece; /* decrease space left in this round */
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if(0 == ch->datasize)
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/* end of data this round, we now expect a trailing CRLF */
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ch->state = CHUNK_POSTCR;
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break;
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case CHUNK_POSTCR:
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if(*datap == 0x0d) {
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ch->state = CHUNK_POSTLF;
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datap++;
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length--;
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}
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else {
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return CHUNKE_BAD_CHUNK;
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}
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break;
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case CHUNK_POSTLF:
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if(*datap == 0x0a) {
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/*
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* The last one before we go back to hex state and start all
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* over.
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*/
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Curl_httpchunk_init(conn);
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datap++;
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length--;
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}
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else {
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return CHUNKE_BAD_CHUNK;
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}
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break;
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case CHUNK_TRAILER:
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/* conn->trailer is assumed to be freed in url.c on a
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connection basis */
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if (conn->trlPos >= conn->trlMax) {
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char *ptr;
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if(conn->trlMax) {
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conn->trlMax *= 2;
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ptr = (char*)realloc(conn->trailer,conn->trlMax);
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}
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else {
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conn->trlMax=128;
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ptr = (char*)malloc(conn->trlMax);
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}
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if(!ptr)
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return CHUNKE_OUT_OF_MEMORY;
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conn->trailer = ptr;
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}
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conn->trailer[conn->trlPos++]=*datap;
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if(*datap == 0x0d)
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ch->state = CHUNK_TRAILER_CR;
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else {
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datap++;
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length--;
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}
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break;
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case CHUNK_TRAILER_CR:
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if(*datap == 0x0d) {
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ch->state = CHUNK_TRAILER_POSTCR;
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datap++;
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length--;
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}
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else
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return CHUNKE_BAD_CHUNK;
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break;
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case CHUNK_TRAILER_POSTCR:
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if (*datap == 0x0a) {
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conn->trailer[conn->trlPos++]=0x0a;
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conn->trailer[conn->trlPos]=0;
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if (conn->trlPos==2) {
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ch->state = CHUNK_STOP;
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datap++;
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length--;
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/*
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* Note that this case skips over the final STOP states since we've
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* already read the final CRLF and need to return
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*/
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ch->dataleft = length;
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return CHUNKE_STOP; /* return stop */
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}
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else {
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#ifdef CURL_DOES_CONVERSIONS
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/* Convert to host encoding before calling Curl_client_write */
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result = Curl_convert_from_network(conn->data,
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conn->trailer,
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conn->trlPos);
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if(result != CURLE_OK) {
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/* Curl_convert_from_network calls failf if unsuccessful */
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/* Treat it as a bad chunk */
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return(CHUNKE_BAD_CHUNK);
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}
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#endif /* CURL_DOES_CONVERSIONS */
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if ( !data->set.http_te_skip )
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Curl_client_write(conn, CLIENTWRITE_HEADER,
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conn->trailer, conn->trlPos);
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}
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ch->state = CHUNK_TRAILER;
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conn->trlPos=0;
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datap++;
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length--;
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}
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else
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return CHUNKE_BAD_CHUNK;
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break;
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case CHUNK_STOPCR:
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/* Read the final CRLF that ends all chunk bodies */
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if(*datap == 0x0d) {
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ch->state = CHUNK_STOP;
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datap++;
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length--;
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}
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else {
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return CHUNKE_BAD_CHUNK;
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}
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break;
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case CHUNK_STOP:
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if (*datap == 0x0a) {
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datap++;
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length--;
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/* Record the length of any data left in the end of the buffer
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even if there's no more chunks to read */
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ch->dataleft = length;
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return CHUNKE_STOP; /* return stop */
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}
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else {
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return CHUNKE_BAD_CHUNK;
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}
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default:
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return CHUNKE_STATE_ERROR;
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}
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}
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return CHUNKE_OK;
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}
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#endif /* CURL_DISABLE_HTTP */
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